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  #1  
Old 08-18-2019, 10:26 PM
Chuck3154 Chuck3154 is offline
 
Join Date: Mar 2019
Posts: 13
Default Grooves on Colt slide

I received a Remington Rand frame/Colt slide 1911A1 from the CMP and have noticed scratches/grooves running along each side of the front sight blade.
I first noticed them after returning from the range, but I donít think they are cracks since the deeper, right side, muzzle end groove is round bottomed and covered by the Parkerizing.
They can be faintly seen as far as 2Ē rearward and there is an offset toward the rearmost portion.
The inside of the slide shows no signs of cracking near the square sight base.
It is my guess that the grooves are from tools used to install/replace the front sight at some point in time.
Can anyone more familiar with these pistols (most of you) comment on what Iíve described?
The photos show the Colt markings on the left side of the slide (no other markings), as well as the scratches/grooves around the front sight, and the underside of the slide showing the sight base.

https://imgur.com/a/NyETy8F
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  #2  
Old 08-19-2019, 07:05 AM
DDRode DDRode is offline
 
Join Date: Oct 2009
Location: Benson, MN
Posts: 2,014
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Any one of several milling operations would account for those tool marks - both inside & outside.

SEE: https://forum.m1911.org//temp/1911manufacture.pdf

Removing & replacing the front sight wouldn't make those marks.

SEE Page 26: http://pdf.textfiles.com/manuals/MIL..._june_1964.pdf

The front sight looks like it mighta been touched up on a belt grinder to clean up some tool marks or molding flash (a common injection molding defect).

That would also account for those grind marks at the top front of the slide (the operator got a little sloppy and nicked it).

PARTING SHOT:

The installation of the front sight was one of the last operations, so I'm guessin' a line inspector didn't like to looks of it and sent it over to the REWORK station to be touched up before final inspection & parkerizing!!!

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Dion D. Rode SFC-13F40 (RET)
USN 66-70 (VAH-123, NAVSTA KEFLAVIK, VAW-126)/USNR 72-74/USAR 83-90 (3/14FA-205TH INF BDE)/ MNARNG 90-00 (34TH "RED BULL" DIVARTY)



Last edited by DDRode; 08-21-2019 at 11:15 AM.
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  #3  
Old 08-19-2019, 02:18 PM
Chuck3154 Chuck3154 is offline
 
Join Date: Mar 2019
Posts: 13
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DDRode: Thanks very much for your reply and references. I've got some reading to do. When I first noticed the marks I thought "cracks" but upon closer examination, and after taking the pictures, I realized they were something else. I guess for a service pistol function is more important than cosmetics. Thanks again.
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  #4  
Old 08-19-2019, 03:22 PM
colemanw colemanw is online now
 
Join Date: Jul 2013
Location: Eastern Washington
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the roughness on the inside looks like chatter from a worn cutter.
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  #5  
Old 08-20-2019, 09:25 AM
DDRode DDRode is offline
 
Join Date: Oct 2009
Location: Benson, MN
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Quote:
Originally Posted by colemanw View Post
the roughness on the inside looks like chatter from a worn cutter.
The tool marks inside the slide were caused by the deep-hole drill...no need for a smooth surface in there so they probably used a coarse bit!!!

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Dion D. Rode SFC-13F40 (RET)
USN 66-70 (VAH-123, NAVSTA KEFLAVIK, VAW-126)/USNR 72-74/USAR 83-90 (3/14FA-205TH INF BDE)/ MNARNG 90-00 (34TH "RED BULL" DIVARTY)



Last edited by DDRode; 08-21-2019 at 11:14 AM.
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